Re: CRC for Apple IIe

[nparker@cie-2.uoregon.edu (Neil Parker)]

In article <4cguaq$5af@overload.lbl.gov> Ted de Castro <tdc@ehssun.lbl.gov>
writes:
[text reformatted to be legible on 80-column screens]
>Hi - I am trying to find a version of Cyclical Redundancy Check (CRC) program
>for APPLE IIe.
>
>This program is available in many other platforms that I am familiar with -
>namely CP/M, DOS, UNIX.
>
>I am transferring some files from old APPLE II media to DOS for permanent
>archiving and I'd like the CRC program so I can verify the integrity of the
>transfer without having to read each and every file after xfer.
>
>If this program doesn't exist in the APPLE IIe world - it should ... to that
>end I can offer a programmer the source code of other versions - since it IS
>in the public domain.
>
>The files I am transferring are from PRO DOS disks.
>
>Any help in finding a CRC program for APPLE II would be appreciated.

Would raw 6502 source code for CRC calculations be sufficient?  Source code
for both 16-bit and 32-bit CRCs on the 6502 is available from my home page,
http://cie-2.uoregon.edu/~nparker/.  Writing a human-useable "wrapper" around
these routines would probably be pretty easy.  (If you don't have WWW access,
let me know--I'll be happy to post or e-mail the source code.)


Shrinkit (the standard Apple II archiving program) automatically computes
and stores CRCs in its archives.  Unfortunately, it doesn't display them on
the screen.

               - Neil Parker
-- 
Neil Parker                       | No cute quote, no cute ASCII art, no cute
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